Bolting-ttp jack



W. F. YOUNG.

BOLTING-UP JACK.

APPLlCATlON men DEC. 20. 1918.

L5 6 Patented June 3, 19m.

2 SHEETSSHEET 1.

INVENTOR BY W W C,

A TTORNEYS W. F. YOUNG.

BOLTING-UP JACK.

APPLlCATlON FILED DEC. 20, ms.

Patented June 3, 1919.

2 SHEETSSHEET 2.

FQ f WILLIAM F. YOUNG, OF BREMERTON, WASHINGTON.

BOLTING-UP JACK.

asoaeeo.

Application filed December 20, 1918.

To all whom it may concern.

Be it known that I, WILLIAM F. YOUNG, acitizen of the United States, andresident of Bremerton, county of Kits'ap, and State of vVashin-gtom-haveinvented certain new and useful Improvements in Bolting-Up Jacks, ofwhich the following is a specification.

My invention relates to jacks which are employed for the purpose ofdrawing plates together in ship building operations. My inventionconsists of a screw-jack operated by a worm and so designed that it maybe made to act upon two plates to draw them closely together in order tosecure them in place preliminary to riveting.

The object of my invention is to provide a jack for this purpose whichshall be powerful and rapid in its action, and which is well adapted tothis particular purpose.

The features of my invention, which I deem to be novel and upon which Idesire to obtain patent protection, will be herein defined by theclaims.

The accompanying drawings show my invention in its present preferredform of construction.

Figure 1 is a longitudinal section through the jack.

Fig. 2 is a side elevation of the jack, with a portion of the casingbroken away to show the worm.

Fig. 3 is a face View of a nut, and Fig. 4:

I is aside view of a portion of the bolt which is used for passingthrough the plates and for engaging the opposite side of the plate inorderto pull the two together.

Fig. 5 is a partial, transverse section through the operating worm.

, This jack is designed for use in drawing together the plates used toform the outer skin of a ship, and in fact for drawing any and allplates so placed as to permit of this being done, into close Contactwith the member to which they are to be secured. This work sometimesrequires the exertion of a very heavy pull. I

The main body of the jack has an outer casing 1, which is centrallychambered for the reception of the screw -threaded bar which forms theram. Also-for: the reception of the worm wheel, which is at the sametime a nut and'by: which the power is applied to the ram. The centralchamber 10 is axially placedv in the casing and is oi such Specificationof Letters Patent.

Patented June 3, 1919.

Serial No. 267,564.

size as to furnish a freely moving bearing for the ram 2.

The ram 2 is a' cylindrical bar, exteriorly threaded, and also providedwith an axial hole of such size as to receive the pulling bolt 3. Thishole passes through the ram from end to end and the pulling bolt 3 islong enough to extend beyond this ram at the end so as to be insertiblethrough the holes in the plates.

It has a head 30 at one end and at the other end a threaded section 31,which is adapted to receive a nut 33. For convenience in handling andrapidity of operation, this nut and bolt may be provided withinterrupted threads, after-the manner indicated in Fig. 3, in which thesegment 32 represents the portions of the circle which are cut away romone of these elements, and the sections 31, the portion which is cutaway from the other. As shown, these are each one-quarter of a circle.

With thisexpedient it is possible to slip the nut 0n the bolt until itcontacts with the plate and then by giving it a quarter turn, secure itin place. It reduces materially the iinlie necessary to advance the nutupon the The nut which engages the ram 2 is shown as a worm gear 4:.This occupies an enlarged portion 12 of the chamber in the easing at oneend of said chamber. The wheel has a thrust bearing upon the shoulder inthe casing, and also upon the plate 13, which incloses this end of thecasing.

The ram bar 2 is provided with a groove 22, the same being in eflect akeyway, and a key 23 carried by the casing enters this keyway and thuspermits the ram bar to reciprocate while preventing its turning.

A worm 6 is mounted in one side of the chamber 12 and has its shaft 60projecting therefrom, preferably at each end. Preferably a portlon, atleast, of the ends of the shaft 60 has the terminal sections '61 madesquare, for the reception of an operating crank or other turning means.I have showna crank 7 applied to one end thereof. This crank if maderemovable, may be applied to either end of the shaft, as is mostconvenient for operation.

I prefer to provide the outer end of the ram 2 with a rounded endsurface, as 21, so that actual contact with the plate will be close tothe holes and if for any reason the bolt is slightly inclined, thecontact with the plate will be close to the bolt instead of being atsome distance therefrom, as it would be with a flat plane end of theram.

When the casing 1 is placed against the plates I may employ a washer, as5, having a rounded outer surface. Such a "Washer may also be placedbeneath the nut 38 of the pulling 'bolt.

In using this device, the pulling bolt 3 is inserted through the holesof the two plates. I have indicated two plates at 9 by dotted lines. Thenut 33 is advanced as far as it may be, conveniently, by hand, thensecured in place, and the operation of the jack commenced.

This type of jack is extremely powerful and will draw the plates closetogether even if they be heavy and considerably separated; In operatingthe jack, if such a tool is convenient, a pneumatic drill operatingmotor may be placed over the square ends of the shaft 61 and in this waythe same be turned rapidly up to such a point where its power is notsuificient to turn it farther. In that event additional power may beapplied by hand through a crank.

What'I claim-as my invention is:

1. A plate pulling jack comprising a casing longitudinally chambered toreceive a ram bar and its nut and adapted to engage one of the plates, athreaded ram, bar mounted to reciprocate within the casing and axiallybored to receive a pulling bolt, a nut for said ram bar having thrustbearing support from the casing, means for turning said nut, means forpreventing turning of the ram bar, anda pulling bolt passing entirelythrough the ram and adapted to pass through holes in the plates, saidbolt being provided at opposite ends with respectively a head and 'a nutadapted to engage with the ram bar and the other plate.

2. A plate pulling jack comprising a casing having a ram receivingchamber extending lengthwise thereof from one end, said chamber having anut-receiving enlargement at its outer end, an externally threaded'ramhaving a keywaytherein and adapted to enter and reciprocate in saidchamber, a key carried by the casing and entering the keyway to preventturning of the ram, a nut upon said ram and within the outer enlargedpart of said chamber, a plate closing the outer part of the chamber andconstituting one thrust support for the nut, the ram being axially boredthroughout its length, a pulling bolt extending through said bore andhaving a projecting end adapted to pass through the holes in the plates,said bolt being provided with means, as a head and a nut, adapted toengage respectively with the other plate and with the ram bar to enablethe plates to be drawn together.

Signed at Seattle, Washington, this 14th day of December, 1918.

WILLIAM F. YOUNG.

